My two cents
the mods here do a good job making this a great forum to participate in. The level of maturity here is much better than some of the other ones that sounds like it's run by 14 year olds. But as other have mentioned, CP is gotten pretty large so it's impossible for just the mods to go through and assign red squares to all the deserving people. If more people would recommend posts (myself included), then some of the more consistent posters would get noticed for their quality (or lack of) of their posts.
Another way to get noticed is just by participating more often (but I'm still talking quality over quantity). I noticed a lot of the posters in the elusive red square clubs are those that are the regulars, and have gotten to know some of the posters.
I'm usually more of an OT poster (and the tech section) and I mentioned before how interesting the variety of opinions and conversations that go on over there.
After that, just reading whatever I post (especially for grammar and spelling as some posters are more unforgiving than others) and taking part more is the strategy I'm doing to maybe get into that club one day. Also, I continue to enjoy being the government (health) insider so I'll post health stuff every so often